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2. Cancel only the default behavior by using the preventDefault () method.喜庆的音乐里，严家的老夫妻二人正在为过中秋节抢购月饼，大儿子严志国在广州正准备带妻子李芸，女儿和儿子回山东老家过节。因为公务，严志国没能赶回家里过节。严母为不能聚齐的家人，而情绪低落。此时恰巧得知好姐妹蔡婆婆患肾病，没多久就辞世的消息。自己也感到身体不适，被老朋友鲁大夫劝说到市医院检查身体……故事以北宋哲宗时代为背景，通过丐帮帮主乔峰、大理世子段誉、少林小僧虚竹三人的江湖历险与爱恨情仇，以及围绕在他们周围的一众江湖人物，展现了纷繁复杂的武林恩怨和无计可消除的贪嗔痴怨，勾勒了一副充满人情世态的生活画卷，亦象征大千世界的芸芸众生，皆逃不出“情”之一字带来的痛苦纠缠。When keeping a safe distance of 100 meters from the car in front, the top speed is 100 kilometers per hour.On August 15, 1999, Weng Siliang, the last principal strategist, was successfully arrested by the public security organs. 　　Although this tutorial is named "Java Design Pattern", design pattern is not a patent of Java. It is also applicable to other object-oriented programming languages such as C + +, C #, JavaScript, etc.When a client accesses a server's web service, The client sends a message to the network card, The tcp/ip stack is part of the kernel, Therefore, the client information is transferred to the web service in user space through the kernel's TCP protocol, At this time, the destination destination of the client message is on the socket (IP: Port) that the web service is listening for. When a web service needs to respond to a client request, The destination destination of the response message sent by the web service is the client, At this time, The IP and port that the web service listens on becomes the origin instead, As we said, Netfilter is the real firewall, It is part of the kernel, Therefore, if we want the firewall to achieve the goal of "fire prevention", You need to set up checkpoints in the kernel. All incoming and outgoing messages have to pass through these checkpoints. After checking, those that meet the release conditions can be released, while those that meet the blocking conditions need to be blocked. As a result, input checkpoints and output checkpoints appear. These checkpoints are not called "checkpoints" but "chains" in iptables.